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20891075 = 52835643
BaseRepresentation
bin100111110110…
…0010111000011
31110022101011112
41033230113003
520322003300
62023433535
7342366632
oct117542703
943271145
1020891075
1110879857
126bb58ab
134435baa
142abb519
151c79e35
hex13ec5c3

20891075 has 6 divisors (see below), whose sum is σ = 25904964. Its totient is φ = 16712840.

The previous prime is 20891071. The next prime is 20891081. The reversal of 20891075 is 57019802.

It is not a de Polignac number, because 20891075 - 22 = 20891071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20891071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 417797 + ... + 417846.

It is an arithmetic number, because the mean of its divisors is an integer number (4317494).

Almost surely, 220891075 is an apocalyptic number.

20891075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20891075 is a deficient number, since it is larger than the sum of its proper divisors (5013889).

20891075 is an equidigital number, since it uses as much as digits as its factorization.

20891075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835653 (or 835648 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 20891075 is about 4570.6755518194. The cubic root of 20891075 is about 275.4145812879.

The spelling of 20891075 in words is "twenty million, eight hundred ninety-one thousand, seventy-five".

Divisors: 1 5 25 835643 4178215 20891075